A geobiological comparison of high-and low-Silica containing weathered volcanic glass Kelly, Laura ; Herrera, Aude ; Olsson-Francis, Karen ; Andersen, Gary ; Piceno, Yvette ; Cockell, Charles Abstract Publication: Geochimica et Cosmochimica Acta Supplement Pub Date: June 2009 Bibcode: 2009GeCAS..73R.637K